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Mastervolt AC Master 12/300 Pure Sine Wave Inverter 300 W 12 V

Mastervolt AC Master 12/300 is a pure sine wave inverter for 12 V installations, delivering 300 W continuous and 600 W peak. High‑frequency technology with input/output galvanic isolation ensures compatibility with onboard electronics, USB chargers and small 230 V 50 Hz appliances. Recommended battery capacity 60 Ah. IP23 rating for vertical wall mounting; protections against short circuit, overload, over‑temperature and abnormal battery voltage. 90% efficiency, 4 W idle draw in energy‑saving mode.

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Product Details

Weight
1.16 kg.
Degree of protection
IP23
Efficiency
90%
Technology
Alta frequenza con isolamento ingresso/uscita
Dimensions
210×130×60 mm.
Potenza continua
300 W
Tensione nominale batteria
12 V
Capacità batteria consigliata
≥60 Ah
Tensione uscita
230 V 50 Hz
Forma d'onda
Sinusoide pura
Corrente ingresso a carico nominale
22.5 A
Tensione bassa spegnimento
10 V ±0.5 V
Tensione bassa accensione
11 V ±0.5 V
Tensione alta spegnimento
16 V ±0.5 V
Tensione alta accensione
14.5 V ±0.5 V
Range termico
-20 °C / +40 °C
Fusibile DC minimo
2×40 A
Sezione cavo minima
1.5 m. fornito
Connessione AC
IEC universale
Isolamento galvanico
Protezioni
Sovra-temperatura, sovraccarico, cortocircuito, tensione batteria alta/bassa
Certificazioni
CE, E-mark, ABYC A-31
Compatibilità MasterBus
No
Ventilatore
Naturale/Forzato

Description

The Mastervolt AC Master 12/300 delivers 230 V 50 Hz AC on board from a 12 V battery bank, with a pure sine wave suitable for sensitive electronics, battery chargers and small appliances. Continuous power is 300 W at 25°C, derating to 250 W above 40°C—an important consideration for installs in engine rooms or warm lockers. A 600 W peak for 5 seconds handles inrush currents at start‑up.

High‑frequency galvanic isolation between input and output protects the onboard system from interference between the DC side and the AC side. 90% efficiency reduces conversion losses, while the energy‑saving mode keeps idle consumption to 4 W. Protections against over‑temperature, overload, short circuit and abnormal battery voltage—with defined shutdown and restart thresholds—ensure safe operation even under varying loads. Vertical wall mount with IP23 protection rating; minimum recommended battery capacity 60 Ah.

Main features

  • Pure sine wave compatible with sensitive equipment such as marine electronics, chargers and motors, avoiding the distortion typical of modified‑sine inverters
  • Galvanic isolation input/output via high‑frequency technology, electrically separating the battery from the AC circuit and reducing interference risk to the onboard system
  • Continuous power 300 W at 25°C, 250 W above 40°C with thermal derating to be factored into sizing for hot‑environment installations
  • Load peak 600 W for 5 seconds to manage start‑up surges of loads with high inrush current
  • Energy‑saving mode with 4 W idle draw, useful to limit battery drain during prolonged lay‑ups
  • Comprehensive protections against over‑temperature, overload, short circuit, and high/low battery voltage, with calibrated shutdown and restart thresholds
  • ABYC A‑31 certification for marine inverters, plus CE and E‑mark, relevant for US‑built vessels or international charter fleets
  • IP23 wall‑mount installation in vertical position, supplied with 1.5 m DC cable and IEC connector for quick commissioning

Scope of supply

  • AC Master 12/300 inverter
  • 1.5 m DC cable
  • IEC plug

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